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How fast is 150 kilometers per hour?

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It's about twenty times as fast as Michael Phelps.
In other words, 150 kilometers per hour is 21.450 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.04662 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
Setting a world record, Michael Phelps swam the 200 m freestyle in 1:42.96 for an average speed of 6.993 kph. Phelps would go on to win nine gold medals individually in the 2008 Olympics - more than all but eight of the competing nations.
It's about one-twentieth as fast as a Bullet (Rifle).
In other words, 150 kilometers per hour is 0.0455 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 22 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 3,294 kph. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about thirty times as fast as Walking Pedestrians (in Manhattan).
In other words, the speed of Walking Pedestrians (in Manhattan) is 0.031 times 150 kilometers per hour.
(Manhattan; average speed; 8,978 person-sample)
A 2006 Study by the New York City Department of City Planning found that pedestrians in that city walk at an average rate of 4.70 kilometers per hour. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 5.10 kilometers per hour
It's about 80 times as fast as an Iceberg.
In other words, the speed of an Iceberg is 0.01 times 150 kilometers per hour.
(a.k.a. Berg) (Newfoundland iceberg average)
Moved by ocean currents and wind, icebergs can drift at speeds of about 2 kilometers per hour. The largest iceberg ever recorded was a found near Baffin Island, Nunavut and was estimated to be nine billion metric tons.
It's about one-two-hundredth as fast as The Space Shuttle.
In other words, 150 kilometers per hour is 0.0053808 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 185.850 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 27,877 kph. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.
It's about 600 times as fast as a Sloth.
In other words, 150 kilometers per hour is 620 times the speed of a Sloth, and the speed of a Sloth is 0.0016 times that amount.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 0.24 kph. Long thought to be lengthy sleepers, a 2008 study concluded that sloths sleep an average of only 9.6 hours per day.
It's about one-one-thousandth as fast as a Meteor.
In other words, 150 kilometers per hour is 0.00099 times the speed of a Meteor, and the speed of a Meteor is 1,000 times that amount.
(formally Meteoroid or meteorite, depending on the context; a.k.a. "shooting star", a.k.a. "falling star")
Small meteoroids enter the Earth's atmosphere at speeds between 40,000 kph and 260,000 kph, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 10,000 kph.